Model return null when string expected

Hi Folks - My app sets audition results via a Livewire component. The result is dependent on a number of factors, so I'm using a factory to determine which model (algorithm) to use. In testing to ensure that the factory is working, I'm currently returning the model name as a string.

Here's the rub, when I initialize the Factory in the mount() method, the string comes back exactly as expected. However, when I call the factory, the string comes back as null. I can't see my error, so I'd appreciate your help! Here's the Factory with relevant methods:

<?php

namespace App\Models\AuditionResults;

use App\Models\Events\Versions\VersionConfigAdjudication;
use Illuminate\Database\Eloquent\Collection;
use Illuminate\Database\Eloquent\Model;
use Illuminate\Support\Facades\Log;

class Factory extends Model
{
    public $algorithm; //will be an evaluated model
    private bool $alternatingScores;
    public Collection $eventEnsembles;

    private string $scoreDirection;
    public VersionConfigAdjudication  $versionConfigAdjudication;

    public function setAlternatingScores(): void
    {
        $this->alternatingScores = (bool)$this->versionConfigAdjudication->alternating_scores;
    }

    public function setModel(): void
    {
        $scoreType = $this->alternatingScores ? 'AlternatingScores' : 'StackedScores';
        $direction = $this->scoreDirection === 'asc' ? 'Ascending' : 'Descending';
        $ensembleCount = $this->eventEnsembles->count() === 1 ? 'SingleEnsemble' : 'MultipleEnsembles';

        $this->algorithm = "{$scoreType}{$direction}{$ensembleCount}Algorithm";

    }

public function setScore(int $score, int $voicePartId): void
    {
//THIS DOESN'T WORK, i.e. returns null
        Log::info('Factory->algorithm: ' . $this->algorithm);
//[2024-11-11 11:34:38] local.INFO: Factory->algorithm: 
    }

    public function setScoreDirection(): void
    {
        $this->scoreDirection = $this->versionConfigAdjudication->scores_ascending ? 'asc' : 'desc';
    }

}

and the Livewire component

<?php

namespace App\Livewire\Events\Versions\Tabrooms;

use App\Models\AuditionResults\Factory;
use App\Models\Events\Event;
use App\Models\Events\Versions\Participations\AuditionResult;
use App\Models\Events\Versions\Scoring\ScoreFactor;
use App\Models\Events\Versions\Version;
use App\Models\Events\Versions\VersionConfigAdjudication;
use App\Models\UserConfig;
use Illuminate\Support\Facades\Log;

class TabroomCutoffComponent 
{
    public Factory $factory;
    public array $ensembles;
    public Event $event;
    public array $scoresByVoicePart = [];
    public Version $version;
    public VersionConfigAdjudication $versionConfigAdjudication;
    public int $versionId = 0;
    public array $voicePartAbbrs = [];

    public function mount(): void
    {
        parent::mount();

        $this->versionId = UserConfig::getValue('versionId');
        $this->version = Version::find($this->versionId);
        $this->versionConfigAdjudication = VersionConfigAdjudication::where('version_id', $this->versionId)
            ->first();
        $this->event = $this->version->event;
       
        $this->factory = new Factory();
        $this->factory->eventEnsembles = $this->event->eventEnsembles;
        $this->factory->versionConfigAdjudication = $this->versionConfigAdjudication;
        $this->factory->setAlternatingScores();
        $this->factory->setScoreDirection();
        $this->factory->setModel();
//THIS WORKS, i.e. returns the expected string
        Log::info('algorithm: ' . $this->factory->algorithm);
//[2024-11-11 11:34:29] local.INFO: algorithm: StackedScoresDescendingSingleEnsembleAlgorithm  
    }

    public function clickScore($score, $voicePartId): void
    {
//THIS DOESN'T WORK, i.e. returns null
        Log::info('algorithm: ' . $this->factory->algorithm);
    //[2024-11-11 11:34:38] local.INFO: algorithm:  
        $this->factory->setScore($score, $voicePartId);
    }

}

Your help is appreciated!

LaryAI

1 year ago

Best Answer

Level 58

The issue you're experiencing seems to be related to the lifecycle of the Livewire component and how the state of the Factory object is being managed. In Livewire, the component's state is serialized and deserialized between requests, which can lead to unexpected behavior if the state is not properly managed.

Here are a few steps to help resolve the issue:

Ensure Proper Initialization: Make sure that the Factory object is properly initialized every time you need to use it. This includes setting all necessary properties before calling methods that depend on them.
Use Public Properties: Since Livewire serializes public properties, ensure that any property you need to persist across requests is public. In your case, algorithm is already public, so this should be fine.
Reinitialize State in Methods: If the algorithm property is being reset to null between requests, you might need to reinitialize or recompute it in the clickScore method. This can be done by calling setModel() again if necessary.
Check for State Changes: Ensure that no other part of your code is inadvertently modifying the algorithm property. This includes checking for any unintended side effects in other methods or lifecycle hooks.

Here's a potential solution to ensure the algorithm is set correctly:

public function clickScore($score, $voicePartId): void
{
    // Recompute the model if necessary
    if (is_null($this->factory->algorithm)) {
        $this->factory->setModel();
    }

    Log::info('algorithm: ' . $this->factory->algorithm);
    $this->factory->setScore($score, $voicePartId);
}

By checking if algorithm is null and recomputing it if necessary, you ensure that the property is always set before it's used. This approach helps mitigate issues related to the state not being persisted correctly across Livewire requests.

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